body{
    margin: 0;
}

.box{
    width: 100px;
    height: 100px;
    background-color: #f00;
    /* 动画 */
    animation: move 5s infinite;
    position: absolute;
}

@keyframes move {
    0%{
        left:0;
        top:0;
    }
    50%{
        left:300px;
        top:200px;
    }
    100%{
        left:0;
        top:0;
    }
}

/* 关键帧 */
@keyframes blingbling {
    0%{
        opacity: 1;
    }
    50%{
        opacity: 0;
    }
    100%{
        opacity: 1;
    }
}